What make its feet useful for swimming?
the webbed part, it helps them to resist water more... making them swim faster.Depending on the species, different birds have different adaptations that make their feet useful for swimming. Some birds (such as ducks) have webbing between their toes, others (such as moorhens) have flattened toes. In both cases the birds use their feet as paddles.Most birds' feet are not useful for swimming at all, and many species will not even attempt to swim (or are only able to swim very poorly). Ironically, despite being the most iconic swimming birds, penguins do not have any foot adaptations to help them swim. They use their wings to 'fly' through the water.